Docs: describe that simpleCellRangeToString does not work with column ranges and row ranges

[sequba]

Context

Issue #1375 should be fixed by making simpleCellRangeToString work with all types of ranges, but until we do it, I added a disclaimer to the docs.

How did you test your changes?

local docs build

Types of changes

• Breaking change (a fix or a feature because of which an existing functionality doesn't work as expected anymore)
• New feature or improvement (a non-breaking change that adds functionality)
• Bug fix (a non-breaking change that fixes an issue)
• Additional language file, or a change to an existing language file (translations)
• Change to the documentation

Related issues:

#1375

Checklist:

• I have reviewed the guidelines about Contributing to HyperFormula and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement.
• My change is compliant with the OpenDocument standard.
• My change is compatible with Microsoft Excel.
• My change is compatible with Google Sheets.
• I described my changes in the CHANGELOG.md file.
• My changes require a documentation update.
• My changes require a migration guide.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.36%. Comparing base (e32e132) to head (06f342a).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1391   +/-   ##
========================================
  Coverage    97.36%   97.36%           
========================================
  Files          169      169           
  Lines        14421    14421           
  Branches      3021     3021           
========================================
  Hits         14041    14041           
  Misses         380      380           

Files	Coverage Δ
src/HyperFormula.ts	99.59% <ø> (ø)

[github-actions]

Performance comparison of head (06f342a) vs base (e32e132)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A |  531.8 | 533.62 | +0.34%
                                      Sheet B | 172.49 | 171.21 | -0.74%
                                      Sheet T | 151.95 | 151.99 | +0.03%
                                Column ranges | 550.83 | 550.38 | -0.08%
Sheet A:  change value, add/remove row/column |   14.1 |  14.03 | -0.50%
 Sheet B: change value, add/remove row/column |  124.3 | 130.63 | +5.09%
                   Column ranges - add column | 154.64 | 155.06 | +0.27%
                Column ranges - without batch | 457.59 | 460.29 | +0.59%
                        Column ranges - batch | 117.65 | 119.03 | +1.17%